Centos 6.5 下通过ethtool限制网卡速率

Love The Way You Lie 2022-08-13 16:53 665阅读 0赞

操作环境：

Centos 6.5 x86_64

ethtool

操作步骤：

查看此时网口em1设备信息

  1. [root@ceph-osd-2 ~]# ethtool em1
  2. Settings for em1:
  3.         Supported ports: [ TP ]
  4.         Supported link modes:   10baseT/Half 10baseT/Full 
  5.                                 100baseT/Half 100baseT/Full 
  6.                                 1000baseT/Full 
  7.         Supported pause frame use: No
  8.         Supports auto-negotiation: Yes
  9.         Advertised link modes:  10baseT/Half 10baseT/Full 
  10.                                 100baseT/Half 100baseT/Full 
  11.                                 1000baseT/Full 
  12.         Advertised pause frame use: No
  13.         Advertised auto-negotiation: Yes
  14.         Speed: 1000Mb/s
  15.         Duplex: Full
  16.         Port: Twisted Pair
  17.         PHYAD: 1
  18.         Transceiver: internal
  19.         Auto-negotiation: on
  20.         MDI-X: Unknown
  21.         Supports Wake-on: g
  22.         Wake-on: d
  23.         Link detected: yes

使用ethtool显示em1网口速率，提示无法设置

  1. [root@ceph-osd-2 ~]# ethtool -s em1 speed 100
  2. Cannot advertise speed 100

后来查找资料，正确设置方法如下

  1. #ethtool -s em1 speed 100 duplex full autoneg off

查看此时em1网口信息

  1. [root@ceph-osd-2 ~]# ethtool em1
  2. Settings for em1:
  3.         Supported ports: [ TP ]
  4.         Supported link modes:   10baseT/Half 10baseT/Full 
  5.                                 100baseT/Half 100baseT/Full 
  6.                                 1000baseT/Full 
  7.         Supported pause frame use: No
  8.         Supports auto-negotiation: Yes
  9.         Advertised link modes:  Not reported
  10.         Advertised pause frame use: No
  11.         Advertised auto-negotiation: No
  12.         Speed: 100Mb/s
  13.         Duplex: Full
  14.         Port: Twisted Pair
  15.         PHYAD: 1
  16.         Transceiver: internal
  17.         Auto-negotiation: off
  18.         MDI-X: Unknown
  19.         Supports Wake-on: g
  20.         Wake-on: d
  21.         Link detected: yes

配置成功

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